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Journal of Flow Visualization and Image Processing
CiteScore™: 0.1 SNIP: 0.312 SJR: 0.11

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v17.i4.50
pages 333-346

FLOW BEHAVIOR IN A PARALLEL-TUBE HEAT TRANSPORT DEVICE ANALYZED BY USING IMAGE PROCESSING

Thanh-Long PHAN
Fujikura Ltd.
Akira Murata
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
Sadanari Mochizuki
Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei-shi, Tokyo 184, JAPAN
Kaoru Iwamoto
Department of Mechanical Engineering, Tokyo University of Science, Noda-shi, Chiba 278-8510; Department of Mechanical System Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
Hiroshi Saito
Mechanical Systems Engineering Course, Tokyo Metropolitan College of Industrial Technology, 1-10-40 Higashi-Ohi, Shinagawa, Tokyo 140-0011, Japan

ABSTRACT

Fluid flow behavior and heat transport rate of Parallel-Tube Heat Transport Devices (PT-HTD) were experimentally investigated using water as a working fluid. In the present PT-HTD, evaporator and condenser chambers were connected through five parallel glass tubes of the same inner diameter. The PT-HTD was vertically set and the bottom evaporator and top condenser were heated and cooled, respectively. The entrainment limit of PT-HTD was observed that may mainly be affected by a small tube diameter. However, the heat-transport rate of PT-HTD is independent of the tube diameter. The unsteady flow behavior was always observed in PT-HTD. The number of tubes in which upward flow occurred increased when the heat-transport rate of PT-HTD increased.